Products, Materials + Tools | Dec 17, 2010

New Citizen LEDs for Lighting

Citizen Electronics Co., Ltd. (Head Office: Fujiyoshida City, Yamanashi Prefecture. President: Yoshihiro Gohta) has developed the CL-L330 series (26W type) and CL-L340 series (41W type) of white LEDs for lighting, of which the luminous flux per LED lamp is more than twice that of the conventional model.

LED lighting has been in the spotlight as LED bulbs are commercially available. However, in most cases it is difficult to provide enough luminous flux for applications with only one LED. Therefore, it is necessary to place two or more LEDs in lights. In such cases, the area in which LEDs are to be placed becomes larger and accordingly the size of the light also tends to become larger. In addition, there is another negative effect. When there are two or more light sources, design to control light such as that of the reflection plate becomes complex.

The newly developed products resolve these problems by dramatically increasing luminous flux per LED and contribute to miniaturized lights and simplified optical design. It is also possible to expand lighting applications substantially where only one LED is used.

Main features:
More than twice the conventional luminous flux
<5000K (kelvin) color temperature type>
26W type: 2800 lm, 41W type: 4390 lm
[The conventional model with the highest luminous flux of our products (13W type): 1400 lm (lumen)]

High luminous efficacy:
In general, for LEDs, the more power supplied to a product, the lower luminous efficacy is likely to become. In response to this problem, we can combine high luminous flux and high luminous efficacy by mounting a number of compact light-emitting dice, of which luminous efficacy is relatively high, in one LED package through utilization of “Citizen Electronics” specialized high-density mounting technology.
The new products, both 26W and 41W types, provide the same high luminous efficacy as that of our conventional model (13W type) which has the highest luminous efficacy of our products.
<5000K color temperature type> 26W type: 104 lm/W, 41W type: 105 lm/W
<3000K color temperature type> 26W type: 73 lm/W, 41W type: 73 lm/W

Thermal resistance:
Our highest level of heat dissipation has been improved by 30% over that of the conventional model. As a measure against heat generation that has significant effects on the service life of LEDs, we have achieved the lowest level of thermal resistance of our LED products, and effective heat dissipation processes are provided, such as transferring heat to a heat sink, etc. In addition, since the whole rear face of the LED package can be used as a heat dissipation route, it is possible to diffuse heat promptly.
26W type: 1.7°C/W, 41W type: 1.0°C/W
[The conventional model with the highest luminous flux of our products (13W type): 2.4°C/W]

Color rendering:
For white LEDs, there is a trade-off between color rendering and luminous efficacy. Color rendering indices are set for the new products by color temperature, based on main applications.
5000K color temperature type: Ra67 (priority placed on luminous efficacy)
3000K color temperature type: Ra83 (priority placed on color rendering)

Main specifications for products CL-L330 Series (26W type)

Product code CL-L330-C26N-C
CL-L330-MC26L1-C
Color temperature (K) 5000
3000
Total luminous flux (lm) 2800
1960
General color
rendering index Ra
67
83
Luminous efficacy (lm/W) 104
73
Input current (mA) 720
Thermal resistance (°C/W) 1.7
Size (mm) L:28.0×19.0×H:1.4

Main specifications for products CL-L340 Series (41W type)

Product code CL-L340-C41N-C
CL-L340-MC41L1-C
Color temperature (K) 5000
3000
Total luminous flux (lm) 4390
3060
General color
rendering index Ra
67
83
Luminous efficacy (lm/W) 105
73
Input current (mA) 900
Thermal resistance (°C/W) 1.0
Size (mm) L:28.5×W:28.5×H:1.4

 Applications:
The 5000K-color temperature (cool color) type is intended mainly for exterior illumination where priority is placed on luminous efficacy. For example, this type is suitable for streetlights, projectors and advertising lights. The 41W type provides, with one LED lamp, the same high luminous flux as that of a general 100W mercury lamp. Therefore, it is expected to reduce power consumption by about 60%. The 3000K-color temperature (warm color) type is intended mainly for interior illumination where priority is placed on color rendering. For example, this type is suitable for down lights for base lighting or spotlights for product rendition. The 41W type provides, with one LED lamp, the same high luminous flux as that of a general 150W halogen lamp. Therefore, it is expected to reduce power consumption by about 70%.

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